Effect of Density on Physical and Mechanical Properties of Reconstituted Small-Sized Bamboo Fibrous Sheet Composite

Zhu, Rong Xian; Yu, Wen Ji

doi:10.4028/www.scientific.net/amr.150-151.634

Cited by 11 publications

(6 citation statements)

References 7 publications

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“…The results pointed out that the density of 0.90 g/ cm 3 is the optimal density for compregs in this study when refer to the thickness swelling. The similar trend has been reported for the TSR of bamboo composites with increased density [31].…”

Section: Resultssupporting

confidence: 88%

Effect of density on the hygroscopicity and surface characteristics of hybrid poplar compreg

et al. 2016

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The objective of this study is to investigate the relevance of hybrid poplar compreg density and its physical properties and surface characteristics, such as hygroscopicity, dimensional stability, wettability, roughness, surface energy, and porosity. The different desired densities (ranging from 0.6 to 1.2 g/cm 3 ) of compreg were achieved using manufacturing processes with various parameters. The results indicated that the water absorption decreased and dimensional stability improved with the density increasing in the range of this study. In addition, the density was contributed to the reduction of the wettability and the roughness of compreg. Furthermore, the evaluation of the surface energy showed that the total surface free energy declined significantly due to the densification process. The high density reduced the apertures present in the vessels and the fiber cells and, consequently, decreased the total porosity of compreg. This, in turn, impeded the penetration of moisture into compreg and reduced its hygroscopicity. a b c Fig. 2 Effect of densities on dynamic contact angle of different liquids on untreated wood and compreg surfaces: a water, b formamide, and c diiodomethane J Wood Sci (2016) 62:441-451 445

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Section: Resultssupporting

confidence: 88%

Effect of density on the hygroscopicity and surface characteristics of hybrid poplar compreg

et al. 2016

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“…Cracks were found in the OBFMs on the inner and outer cylinder walls of the bamboo tubes and, in particular, linear ones with an average depth of 800 m and width of 30 to 300 m, contribute to the strength of OBFRCs by allowing adhesives to penetrate and the internal stress of the inner cylinder walls to be released (Yu et al 2014). These results can be explained by the fact that higher-density composites have a greater amount of polymers per unit volume, due to there being a greater contact between plies after the hot-pressing process, in contrast to lower-density boards (Zhu and Yu 2010; Jeang-Kwan and Jong-Bum 2009). Notably, due to the heterogeneity of permeability in different parts of bamboo, the test specimens demonstrated most of the bond failure at the interfaces between the OBFMs during the bending tests.…”

Section: Physical and Mechanical Properties Bending Strengthmentioning

confidence: 59%

“…In high-density composites with a compact internal structure, the pores are smaller and more dotted and/or linear cracks are blocked by adhesive (Yu et al 2014) because the water cannot easily penetrate the material. The thickness swelling rate (TSR) of wood/bamboo-based reconstituted composites makes the largest contribution to the VSE Zhu and Yu 2010;Bao et al 2016). The hot-pressing process and the compression springback of the composite together increase the TSR .…”

Section: Water Absorptionmentioning

confidence: 99%

Preparation and Characterization of Outdoor Bamboo-Fiber-Reinforced Composites with Different Densities

Rao¹,

Chen²,

Li³

et al. 2017

BioResources

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aOutdoor bamboo-fiber-reinforced composites (OBFRCs) with four different densities were prepared, and the microstructure and physicomechanical properties of pristine samples were evaluated. In addition, the surface color, glossiness, roughness, water absorption, and wettability of the samples were tested to investigate the effects of panel density on the extent of surface weathering due to ultraviolet radiation. The results showed that the OBFRCs exhibited excellent physical and mechanical properties, which improved with increasing density. However, increases in the density led to decreases in the hygroscopicity and dimensional stability of the OBFRCs. After weathering, the surface contact angle and surface roughness increased, and the dimensional stability improved. The surface glossiness, water absorption, and surface free energy decreased. A higher density resulted in improved color stability, which suggested that density played an important role in determining surface photodegradation properties. Thus, densityincreasing treatments had positive effects on the physical and mechanical properties as well as the color stability and wettability of the OBFRCs, but they may negatively affect the roughness and dimensional stability. Based on service-performance and cost-minimization considerations, 1.1 g/cm 3 was determined as the most appropriate density for general applications.

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“…The influence of two molding processes on the properties of materials was linked to temperature, time, pressure, pressure reduction process, density, and molding type. These factors affected the rheological behavior of the resin in the process of gluing and then determined the properties of the bonding interface, which was finally manifested in the differences in the properties of the products [51][52][53][54][55][56].…”

Section: Research Progress Of Bamboo Recombinationmentioning

confidence: 99%

Progress of Bamboo Recombination Technology in China

Huang

Zhang

et al. 2019

Advances in Polymer Technology

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At present, China is the world's largest producer of bamboo resource possessor and bamboo processing. The main processing method of bamboo recombination technology is rolling and compaction, by which a reconstituted material with bamboo fibrotic veneer as matrix and phenolic resin as reinforcement is prepared. It has excellent physical and mechanical properties and can replace high-quality wood to manufacture various engineering structural materials and building decoration materials. This paper reviewed the research process and progress of bamboo recombination technology, the existing technical problems and prospects, in order to provide references for future research on bamboo recombination theory and production practice. In recent years, as a new material with controllable properties, designable structures, and adjustable dimensions, bamboo reconstituted materials have been comprehensively studied from the aspects of pressing process parameters, physicochemical mechanical properties evaluation system, and microstructure characterization, but the research is not comprehensive and has not in-depth view. In the future, the relationship between microstructure and performance should be emphatically studied to clarify the law of mechanical performance change and ultimate mechanical performance under synergistic enhancement effect, as well as the performance change and interface formation of the resin during the entire molding process. Meanwhile, the reliability and relevance of applied research should be further expanded, and the integration of natural and artificial aging environment, process and performance, and macroand microscales should be strengthened.

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Effect of Density on Physical and Mechanical Properties of Reconstituted Small-Sized Bamboo Fibrous Sheet Composite

Cited by 11 publications

References 7 publications

Effect of density on the hygroscopicity and surface characteristics of hybrid poplar compreg

Effect of density on the hygroscopicity and surface characteristics of hybrid poplar compreg

Preparation and Characterization of Outdoor Bamboo-Fiber-Reinforced Composites with Different Densities

Progress of Bamboo Recombination Technology in China

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